Hand swaging tool



Sept 15, 1941- H. A. DOUGLAS 2,256,457

HAND SWAGING TOOL Filed NOV. 26, 1937 Jimi Y Patented Sept. 16, 1941HAND SWAGING TOOL Harry A. Douglas, Bronson, Mich., assigner to H. A.Douglas Mfg. Co., Bronson, Mich., a cor poration of Michigan ApplicationNovember 26, 1937, Serial No. 176,543

16 Claims.

convenient hand tool of this character for exl peditiously andeconomically making electrical lcouplings of the character disclosed inmy Patent Number 2,034,090, dated March 17, 1936.

The full objects and advantages of my invention will appear inconnection with the detail description thereof and the novel features ofmy inventive concept will be particularly pointed out in the claims.

In the accompanying drawing which forms a part of this specification-Figure 1 is a plan View in front elevation of an embodiment of thisinvention;

Figure 2 is an enlarged view similar to Figure l, with the cover plateremoved and partly in section illustrating the normal position assumedby the operating parts before the swaging begins;

Figure 3 is a view similar to Figure 2 with the handles broken Iaway andillustrating the position assumed by the operating parts during or atthe end ci" the swaging action;

Figure 4 is a View in section taken on the line 4 4, Figure 2, lookingin the direction of the arrows;

Figure 5 is a view in section taken on the line 5 5, Figure 3, lookingin the direction of the arrows; and

Figure 6 is a projected detail view of a jaw member and coacting dog.

In the embodiment of this invention as illustrated, the operating head Isupports two similar pivoted spaced apart operating handles 2 and 3, Theoperating head I includes two similar spaced apart parallel plates 4 and5 between which the operating parts are located, and the plates areprovided with aligned apertures 6 and I for the reception of theterminal 8 upon the conductor 9. The terminals 8 are shown having atapered extremity and it is desirable lto swage the tapered portion nearthe end or tures E and 'I may be oi the proper size to receive terminalsof uniform size on either side of the tool head to position the terminaltherein so the swaging action occurs at the proper place on the terminalor, if desired, the apertures may be of proper sizes each to accommodateterminals of diiierent sizes.

The metal of the terminal is swaged upon the metal lof the conductor bycausing four jaw members Ill, II, I2 and I3 to engage and compress themetal of the terminal in four oppositely disposed indentations upon theapplication of pressure upon the handles 2 and 3, as by the hand of theoperator moving the free ends of the handles toward each other. Thehandles 2 and 3 are in the form of levers pivoted intermediate theirlength to the opposite lower corners of the head I, and have portions I4and I5 entering the head I to coact when rotated outwardly with cam dogsI6, Il," I8, and I9, which in turn coact with the jaws I0, II, I2 andI3, respectively, to swage the terminal onto the conductor.

The jaw members I and II of complementary conformation are arranged tobe oscillated about a stud 20 above the terminal receiving apertures 6and l, and jaws I2 and I3 of complementary conformation to members I0and I I are arranged to be simultaneously oscillated about a stud 2|below said apertures 6 and 'I. The studs 20 and 2| are equidistant fromthe center -of said apertures and are in alignment therewith. As shownin Figure 6, one edge of each jaw member is provided with an arcuaterecess 22 of less than a semicircle in extent and concentric with thepivot stud which edge is extended in one direction to form a flatsurface 23 passing through said center and from the other side of therecess in the opposite direction at an obtuse angle to said iiat surfaceto form one side of the apex or tooth 24 of the jaw. The portion of thejaw member adjacent the outer end of the flat surface 23 is constrictedand the edge thereof opposite the flat surface 23 adjacent theconstricted end is provided with an arcuate recess or indentation 25,and the said edge opposite the recess 22 is provided with an arcuaterecess 2S equal to or `slightly greater than a semicircle to form asocket for the reception of a rounded end of the cam dog, hereinafterdescribed. The edge of the jaw member is continued downwardly from thelower termination of the recess 2B to form a curved portion 2'Icontinued to form the other side of the tooth 24, so that the respectivesides are complementary. As shown in Figure 2, the complementary jawmembers I3 and II are mounted with the respective recesses 22 embracingthe stud 2U, and the respective fiat surfaces 23 are normally maintainedin engagement by a spring 28 supported at right angles to the axis ofthe head I by oppositely disposed central projections 29 received inapertures provided therefor in the plates 4 and 5, l

and the free ends 30 of the spring are curved downwardly and inwardly tobe received by the respective indentations 25. In the position shown inFigure 2, the teeth 24 of the jaw members Ill and I! are retracted toclear the apertures 6 and 1 for the reception of the terminal. Whenequal pressure is applied to the jaw members ID and II by the contactwith the cam dogs IB and I1 in a generally downward direction, kthe jawmembers Iii and I I are rotated about the stud 20 .against the tensionof the spring 28 causing the teeth 24 to be brought together in amovement generally in the direction of the center of the apertures E and1, as shown in Figure 3, and upon the removal of the pressure the spring28 returns the jaw members I and I I to the normal position shown inFigure 2, The jaws I2 and I3 are likewise iniiuenced by a spring 23.

The cam dogs, as shown in detail in Figure 6, are of a generally arcuateconstruction having one' end 3l formed ron the arc of a circleconcentric to the arcuate recess 23 of the jaw member and preferably ofan extent equal to or greater than a semicircle to be received in saidrecess and form a ball and socket joint therewith. The opposite end 32is of the same general formation adapted to be engaged by a projectionof one of the handles as hereinafter described. The convex surface 33 ofthe dog adjacent the handle engaging end acts as an operating cam and isprovided with a tangential extension 34 acting as a stop. The cam dogs I6 and I1 are of complementary formation and when assembled with the jawmembers I3 and II, as shown in Figure 2, the stop 34 of the dogs arebrought into engagement with studs 35 mounted between the plates 4 and 5arranged on the radii of a circle concentric with the apertures E and 1and an equal distance from the center line passing through the studs 23and 2|.

The extremities of the portions I4 and I5 of the handles 2 and 3extending within the head I are each provided with inwardly projectingcomplementary cam dog actuating members 36 `having portions cut out onthe arc of a circle concentric to the rounded ends 32 of the cam dogs I6and I1 above the transverse center line of the apertures E and 1 to formseats 31 for the reception of said ends 32, and said members 33 areprovided with upper edges 38 tangential to the arcuate seats 31extending upwardly therefrom toward the vertical center line of the toolhead.

The `jaw members I2 and I3 and cam dogs I8 and I9 are arranged below thetransverse center line of the apertures E and 1 in complemental relationto the corresponding parts above said center line, includingcomplemental studs 35a and a kcomplementary formation upon the cam dogoperating members 36 of the portions I4 and I of the handles 2 and 3.These handles are each pivoted upon studs 39 secured at the oppositelower corners between the plates 4 and 5.

The operation of this hand swaging tool is as follows: v

The terminal 8 is assembled upon the conductor 9 and inserted within theaperture S or 1 of the head I of the tool as shown in Figures 2 and 4.The operator then grasps the handles 2 and 3 and applies pressure tobring them together, rotating the respective handles about theirrespective pivots 39 which movement imparts an outward rotative movementto the portions I4 and I5 causing the operating members 36 to move awayfrom the center of the apertures 6 and 1, and the inclined surfaces 38engaging the adjacent rounded ends 32 of the cam dog members imparts anoutward movement thereto and as the cam surfaces 33 thereon travel overthe studs 35 and a imparts through the ball and socket connection 3lf-26a rotative movement to the jaw members II), Il, I2 and I3, so that theteeth 24 thereon engage with the metal of the terminal 8 and swage thesame onto the conductor 9, as shown in Figure 3. Upon the release of thepressure on the handles 2 and 3 the springs 28 return the parts to theirnormal position.

To insure a uniform predetermined pressure at each operation of the toolin swaging a terminal 8 onto a conductor, each handle is provided withan elongated bearing or slot 40 about the pivot 39. The inner ends ofthe bearings or slots 40 are normally maintained in engagement with thepivots 39 by a coil spring 4I surrounding a sleeve 42` reciprocablymounting a guide pin 43 therein. The sleeve 42 and the guide pin 43 areprovided withenlarged circular heads 44, each provided with a centralexterior projection 45 each adapted to be received within a similarrecess 46 provided upon the adjacent surfaces of the handles 2 and 3 inalignment with the centers of the pivots 33 f when the handles are inthe normally extended position. The spring 4I interposed betweentheheads 44 exertsufcient pressure to maintain the handles in normalrelation' to their respective pivots, as shown in Figure 2, until thepressure exerted in swaging a terminal causes the teeth 24 of the jawmembers to encounter a resistance equivalent to the predeterminedpressure, so that further pressure being applied to the handles 2 and 3overcomes the tensiony of the spring 4I and the elongated bearing slots4I] alloW the handles to move inwardly over the respective pivot studs39 without imparting any additional pressure to the jaw members l0, Il,I2 and I3.

The lstuds 2D, 2|, 35, 35al and 39 are preferably shouldered at each endso that a reduced portion thereof passes through the plates 4 and 5 andit is preferable to rivet these extensions on one side of the plate toform engaging heads 41 on that side and to provide the opposite reducedportions with a screw-threaded surface to receive a threaded nut 48,whereby the plate 4 may be removed from the head of the tool whendesired. It is preferable to expand the metal of the plates 4 and 5 toextend about the heads 44 of the sleeve 42 and guide pin 4I to form ahousing 49 about the spring 4I, as shown in Figure 4.

Having thus described my invention, it is obvious that variousimmaterial modifications may be made in the same without departing fromthe spirit of the invention; and, therefore, I do not wish to beunderstood as limiting myself to the exact form, construction,arrangement, and combination of parts, herein shown and described,

What I claim and desire to obtain by Letters Patent is:

. 1. A hand swaging tool including a head having an aperture forreceiving the article to be swaged and having operating handlespivotally mounted thereon intermediate their ends providing similarportions on each handle entering within .the head, two pairs of jawmembers having article engaging teeth, each pair arranged incomplementary relation to the other and mounted for oscillatory movementabout studs fixed upon the head equidistant from the center of the headaperture, complementary operating members associated with said head inalignment with said aperture extending from the end of each handleextension, and cam dogs operatively 'c onnected to the respective jawmembers and adjacent operating members to coact therewith to oscillatethe jaw teeth to simultaneously compress the article upon .theapplication of pressure 1 1pon the external portions of said handles.

2. The structure of claim 1 wherein the jaw members of eachcomplementary pair are normally held in retracted position by resilientmeans in engagement with the respective members and act to return thejaws to normal upon the release of the handles.

3. The structure of claim 1 wherein the cam dogs are provided with apivotal engagement with the respective jaw members and a slidingengagement with the respective operating members.

4. The structure of claim l wherein the cam dogs are provided with apivotal engagement with the respective jaw members and a slidingengagement with the respective operating members and are mounted insliding engagement with studs carried by the head.

5. The structure of claim l wherein the jaw members of each pair are ofcomplementary conformation to the other member of said pair and each isprovided with a flat surface adapted to be brought into engagement whenthe jaws are retracted.

6. The structure of claim l wherein the jaw members of each pair are ofcomplementary conformation to the other member of said pair and each isprovided with a flat surface adapted to be brought into engagement whenthe jaws are retracted, and wherein the cam dogs are provided with apivotal engagement with each jaw member and a sliding engagement withthe respective operating members and in sliding engagement with studscarried by the head, said studs being arranged equidistant from the headaperture and in complementary relation to each other.

'7. The structure of claim 1 wherein the cam dogs are provided with apivotal engagement with each jaw member and a sliding engagement witheach operating member and are mounted in sliding engagement with studsfixed upon the head with the said studs arranged equidistant from thehead aperture and in complementary relation to each other, and whereineach cam dog surface in sliding engagement with said studs is providedwith a stop engaging the respective stud when the jaw members are inretracted position.

8. The structure of claim 1 wherein each handie is provided withelongated bearings in alignment with each other about their respectivepivots and with resilient means interposed between the handlespreventing adjacent movement afforded by said slots until the jaws haveencountered a predetermined resistance.

9. A hand swaging tool, including a support, a

plurality of complementary jaws pivotally mounted on said support,separate cam members pivotally connected to said jaws, and leverspivotally connected to said support and to said cam members wherebytopivot and direct said jaws toward each other.

10. A hand swaging tool including a support for the followingcombination of elements: four pairs of xed studs, a plurality of jawmembers pivotally mounted on one pair of studs, a plurality of cam dogmembers arranged about said jaw members and engaging two other pairs ofstuds and pivotally connected to said jaw members, and a pair of leversmounted on the other pair of studs and provided with means cooperatingwith said cam dogs whereby to pivot and direct said jaw members towardeach other.

l1. The structure of claim 10 wherein means are provided for normallymaintaining certain of said jaw members in engagement with each other.

l2. The hand swaging tool including a head supporting the followingelements: a pair of studs, a pair of complementary jaws pivotallymounted on one stud and a pair of complementary jaws complementary tothe other pair of jaws mounted on the other stud, a second pair ofstuds, a pair of cam members pivotally connected to one pair of jawmembersand engageab-le with said second pair of stud members, a thirdpair of studs, a second pair of cam members cooperating with the otherpair of jaw members and engaging said third pair of studs, and meanscooperating with said two pairs of cam members to cause the latter tocooperate with said jaws and said second and third pair of studs wherebyto pivot and direct said jaw members toward each other.

13. The structure of claim 12 wherein a lost motion connection isprovided between said cooperating means and said head.

14. A hand swaging tool including a support, two pairs of complementaryjaws pivotally mounted on said support, two pairs of cam members carriedby said support operatively related to said jaws, and means movable backand forth between and engageable with each pair of cam members wherebyto pivot and direct said jaws toward each other.

15. Swaging mechanism including in combination, a support, three pairsof fixed studs secured to said support, a plurality of jaw membersoperatively connected to one pair of studs, a plurality of individualcam members pivotally connected to said jaw members and engaging theother two pairs of studs, and a lever carried by said support providedwith means cooperating with certain of said cam members whereby todirect said jaw members with respect to each other.

16. Swaging mechanism including a head, a pair of fixed studs secured tosaid head, a pair of spaced apart pivotally mounted jaws on said head, apair of cam members engaging said studs and operatively connected tosaid jaws, and means associated with the head movable between and actingupon said cam members causing said cam members to swing about said studswhereby said cams will pivot in a direction opposite to that of saidjaws when said movable means is moved in a certain direction.

HARRY A. DOUGLAS.

